I did a backsplash in my Florida winter home. The walls are older and less than straight, but using a level the tiles went on smoothly. I found I could actually substitute pieces of tile for any area that didn’t seem level like the electrical outlets. I switched out colors that didn’t stand out in problem areas. The tiles were very easy to work with. I actually cut them with sharp scissors. They seem to be sticking great! Florida summer humidity will be the real test, but I did put a leftover strip across the porcelain back of my bathroom vanity. It gets a little damp, but it has not loosened and looks very nice. I am pleased with the tiles. The subway tiles had to be returned as they were too white for my newly painted cupboard doors. The tiles arrived in a timely fashion, but I am still awaiting my refund. It’s been over a month since the company received my return. I followed the directions as per the company.